Position-Input Display Electrode Shielding to Reduce Manufacturing Cost
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Solution Overview
Problem
The manufacturing costs of liquid crystal display devices with in-cell touch panel functions are increased due to the need for additional processes to form shield lines to prevent image disturbances caused by leakage electric fields.
Innovation Solution
A display device with a position input function that includes a pixel electrode, a common electrode, position detection electrodes, a position detection line, a pixel connection line, and a shield electrode, where the shield electrode overlaps with a partition opening and is on the same layer as the position detection line, reducing the need for a dedicated manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shield lines are arranged on the insulating film to cover gaps between adjacent sensor electrodes, then display quality deterioration due to leakage electric fields is prevented, but manufacturing costs increase due to additional conductive film formation and patterning processes
Solution Approach 1:
The patent merges the shield line function with existing electrode structures by making the common electrode extend into the gap regions between sensor electrodes. This integration eliminates the need for separate shield lines while maintaining the electric field shielding effect, thus preventing display quality deterioration without adding manufacturing processes
Solution Approach 2:
The common electrode serves dual functions: it provides the common potential for the sensor electrodes while simultaneously acting as a shield in the gap regions. By making the common electrode multi-functional, the patent eliminates the need for dedicated shield structures, reducing manufacturing complexity and cost
2Object-affected harmful factors
If a dedicated shield line structure is added, then electric field leakage is suppressed, but device complexity increases due to additional layers and processes
Solution Approach 1:
The patent combines the shielding function with the common electrode structure, eliminating the need for separate shield lines. The common electrode is designed to extend into gap regions, providing shielding functionality as an integrated feature rather than as an add-on component
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces manufacturing costs while suppressing deterioration in display quality by weakening electric fields near the end portions of position detection electrodes, thus maintaining image quality.
Implementation Method 1
position detection electrodes detecting an input position input by the position input body, wherein the position detection electrodes form a capacitance with the position input body
Implementation Method 2
a shield electrode extending such that at least a portion thereof overlaps the partition opening, the shield electrode arranged in a same layer as the position detection line and connected to the position detection line
Data Source
AI summary
A display device with a position input function includes a pixel electrode, a common electrode, position detection electrodes, a position detection line, a pixel connection line, and a shield electrode. The common electrode is overlapped with the pixel electrode on an upper layer side or a lower layer side. The position detection electrodes are formed by dividing the common electrode by a partition opening and form a capacitance with a position input body and detect an input position. The position detection line is arranged on an upper layer side or a lower layer side with the common electrode and connected to the position detection electrode. The pixel connection line extends in parallel with the partition opening and is connected to the pixel electrode. The shield electrode extends overlapping with the partition opening and is on a same layer as the position detection line and connected to the position detection line.